B. Answer the questions in about 20-30 words,
1. What is a disaster?
2. What are the types of disaster?
3. What is meant by the focus of an earthquake?
4. Name the scales that we use to measure an earthquake.
5. What are tropical cyclones?
6. Where are Area Cyclone Warning Centres located in India?
7. What is a storm surge?
8. Name the parts of India that are most prone to flood.
9. Define a drought
10. What are the causes of an avalanche?
Answers
Explanation:
1) disaster is a sudden, calamitous event that seriously disrupts the functioning of a community or society and causes human, material, and economic or environmental losses that exceed the community's or society's ability to cope using its own resources. Though often caused by nature, disasters can have human origins.
2)Disasters are of two types Natural and Human induced disasters
3)Focus-The location where the earthquake begins. The ground ruptures at this spot, then seismic waves radiate outward in all directions.
4)There are two primary scales used to measure earthquakes: the Richter scale and the Mercalli scale.
7) Storm surge is the abnormal rise in seawater level during a storm, measured as the height of the water above the normal predicted astronomical tide. The surge is caused primarily by a storm's winds pushing water onshore.
8) West Bengal, Andhra Pradesh , Orissa , Assam etc
9) drought is an event of prolonged shortages in the water supply, whether atmospheric, surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days